Grim new details are revealed about teen's alleged stabbing attack on Bishop ... trends now

A teen who allegedly stabbed Bishop Mar Mari Emmanuel at a Sydney church travelled up to 90 minutes from his home address to allegedly carry out the horrifying attack.

The 16-year-old boy is expected to front court on Friday while under guard in hospital after he was charged with committing a terrorist act under Commonwealth law.

Police allege the teen stabbed the 53-year-old bishop six times and attacked another priest during a live-streamed service at the Christ the Good Shepherd Church in Wakeley on Monday.

AFP Commissioner Reece Kershaw said items, including electronic devices, were seized from the teen's home on Tuesday before investigators spoke to the boy.

'Yesterday (Thursday) investigators attended a medical facility to interview the alleged offender, where he was charged with committing a terrorist act,' he said.

'We allege that the act committed meets the definition (of terrorism) for reasons outlined in a statement effects, but I will not go into those facts here today.

'I want to reinforce that our job is not done ... We target criminality not countries, we investigate radicalisation and not religion.'

Mr Kershaw said investigators were still reviewing electronic material allegedly seized from the boy's home.

'As you'd probably be aware of people have thousands and thousands of videos and images that they store and also what what we find on social media,' he said.